Increase in operating range and efficiency for variable gap axial flux motors
Increase in operating range and efficiency for variable gap axial flux motors
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增加可变间隙轴向磁通电机的运行范围和效率
DOI：
10.1109/ecce.2014.6954207
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Nicholas A. Lambert
中科院分区：
文献类型：
--
作者：
G. Heins;M. Thiele;D. Patterson;Nicholas A. Lambert
对于牵引等需要恒定电源的应用，高效的电力电子利用需要一台能够弱磁的电机。通常，弱磁是通过使用内部永磁电机(IPM)并在d轴上施加电流来实现的。最近的其他工作使用了两个逆变器或电流脉冲来根据工作点对磁体进行消磁和磁化。介绍了一种具有机械弱磁能力的轴向磁通机。实验数据表明，扭矩常数可降低到最大值的5倍，额定工作范围内的效率最高可提高15%。为了证明机械磁通减弱机制对系统效率的影响，利用电机数据对电动摩托车在世界协调轻型车测试程序(WLTC)[1]行驶循环中的性能进行了建模。如果使用自锁自动执行机构，则执行机构所需的峰值功率是牵引电机额定功率的4%，整个驱动周期使用的能量是牵引电机能量使用量的0.05%，这对整体效率的影响可以忽略不计。如果使用非锁定机构，则驱动功率和能量将大大降低。
For applications requiring a constant power source such as traction, efficient power electronic utilization requires an electric machine capable of flux weakening. Usually flux weakening is achieved by using an interior permanent magnet machine (IPM) and by applying current in the d-axis. Other recent work has used two inverters or pulses of current to demagnetize and magnetize the magnets depending on the operating point. This paper presents an axial flux machine with mechanical flux weakening capability. Experimental data shows that the torque constant can be reduced to five times its maximum value and the efficiency in the rated operating range can be increased by up to 15% points. To demonstrate the impact of the mechanical flux weakening mechanism on the efficiency of the system, the motor data was used to model the performance of an electric motorcycle over a World Harmonized Light Vehicles Test Procedures (WLTC)[1] drive cycle. If a self locking automated actuation mechanism is used, the peak power required by the actuation mechanism is 4% of the traction motor power rating and the energy used over the drive cycle is 0.05% of the traction motor energy use, suggesting negligible impact on the overall efficiency. If a non locking mechanism is used, the actuating power and energy will be substantially lower.